Data generated by database event monitors
Database event monitors produce data about database-level counters. You can choose to have the output from a database event monitor to regular tables, files or pipes.
Regardless of the output format you choose, all database event data comes
from one of two logical groups:
In addition, if you choose to have the database event data written to tables, data from an
additional group (CONTROL) is used to generate metadata about the event monitor itself.